Hi,
If you want to SSH the device, then use Transmit, a beautifully simple FTP app, however, one app that has so far not been spoken off here that should be on the tip of everyones tongue is 'PhoneView', it allows you to connect your jailbroken or non-jailbroken ipod/ iphone to your mac via USB, where you can then navigate your way through the various files within, plus if you need to do some serious prowling in all the files you need to tamper with for modding, then go to the preferences and tick 'show full disk mode'.

Really is a perfect addition to every mac owner with an iPod or iPhone, simple, quick, easy and best of all.. non wireless!